Add a release assert that atomic strings are deleted on the same thread they were created
Add a release assert that atomic strings are deleted on the same thread they were created

It's easy to mess this up, and leads to hard to debug corruptions of
the AtomicString table

BUG=246193
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/16358005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151730 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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